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GB/T 21457-2008: Cranes and related equipment -- Accuracy requirements for measuring parameters during testing
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 21457-2008 | English | 94 |
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Cranes and related equipment -- Accuracy requirements for measuring parameters during testing
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GB/T 21457-2008
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Basic data | Standard ID | GB/T 21457-2008 (GB/T21457-2008) | | Description (Translated English) | Cranes and related equipment -- Accuracy requirements for measuring parameters during testing | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J80 | | Classification of International Standard | 53.020.20 | | Word Count Estimation | 5,533 | | Date of Issue | 2008-02-21 | | Date of Implementation | 2008-08-01 | | Adopted Standard | ISO 9373-1989, IDT | | Regulation (derived from) | National Standard Approval Announcement 2008 No.2 (Total No.115) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies in the detection of cranes and related equipment, the test load, distance, principle requires time instrumentation and measurement devices, and other relevant parameters. And gives a test to measure the relative error of the recommended limits. | GB/T 21457-2008: Cranes and related equipment -- Accuracy requirements for measuring parameters during testing
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Cranes and related equipment. Accuracy requirements for measuring parameters during testing
ICS 53.020.20
J80
National Standards of People's Republic of China
GB/T 21457-2008/ISO 9373. 1989
Cranes and related equipment - Test Parameters
The required measurement accuracy
(ISO 9373. 1989, IDT)
Posted 2008-02-21
2008-08-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is identical with ISO 9373. 1989 "Cranes and related equipment test parameter measurement accuracy requirements" (in English).
This standard is equivalent translation ISO 9373. 1989.
For ease of use, this standard made the following editorial changes.
a) "this International Standard" be replaced by "this standard";
b) use a decimal point instead of a decimal comma ",". ",";
c) Remove the preface to international standards.
The standard proposed by China Machinery Industry Federation.
This standard by the National Standardization Technical Committee crane (SAC/TC227) centralized.
This standard by the Beijing Institute of lifting the transport machinery responsible for drafting.
The main drafters of this standard. He uranium.
GB/T 21457-2008/ISO 9373. 1989
Cranes and related equipment - Test Parameters
The required measurement accuracy
1 Scope
This standard specifies upon detection of cranes and related equipment, the test load, distance, time and other relevant parameters and measuring instruments
Principle device requirements, and gives the relative error test recommended limits.
Principle 2 on the instrument and the measuring device requirements
2.1 meters, measuring instruments and measuring devices shall have sufficient measurement accuracy calibration accuracy. To meet the 3.1 standard and other relevant
Associate or product specification relative error of measurement accuracy requested.
2.2 meters and measuring devices used in the test shall be within the recommended time intervals or prior to use for calibration.
3 test measurements allow basic relative error
3.1 As expected parameter does not appear in a number of differences in measurement, only measured once, no need to determine the relative error.
Basic relative error of 3.2 using the parameters of the actual value expressed as a percentage, should be used as measuring test load, distance, time and other relevant parameters
Measurement accuracy. Basic relative error δ application of the following methods and formulas.
2-5 times a measurement.
δ '= 100 x0 -μ
5 times or more measurements.
δ "= 100
N (
N (N-1 Sang)
Where.
[mu] --- arithmetic mean, μ =
N
X0 --- limits;
δ ', δ "--- the relative error in percentage (%) represented.
3.3 Measuring relative error in the basic parameters of the limits recommended in Table 1, for example.
Table 1 Basic parameters measuring the relative error limit Example
Measurement parameters relative error limit /%
1 Dimensions in meters (m).
a) other professional standards or product specification does not specify the shape of basic size
0.5
1.5
GB/T 21457-2008/ISO 9373. 1989
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